I am trying to get a 1-hour interview on a DVD. So far, the first 30 minutes is a 23G file in mp2. If I re-render in mp4 (to reduce file size), will the quality be comparable to 50g of mp2 compressed to 4.7G for the DVD? Does dual-pass add much to the file size? Would VBR reduce it a bit? I've seen various opinions on this. I'm using Vegas.
Export that big file out of FCP or Quicktime Pro as DV NTSC with the sound at 48mhz, should be a preset for that. That should bust it down to a few gigs, then pull it into DSP4. No AIF, use AC-3 audio. That should look just fine and fit quite easily.